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How to select only the first rows for each unique value of a column
Let's say I have a table of customer addresses:
5 Answers
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M_PI works with math.h but not with cmath in Visual Studio
I am using Visual Studio 2010. I have read that in C++ it is better to use <cmath> rather than <math.h> .
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Escape regex special characters in a Python string
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Use re.escape
>>> import re
>>> re.escape(r'\ a.*$')
'\\\\\\ a\\.\\*\\$'
>>> print(re.escape(r'\ a.*$'))
\\\ a\.\*\$
>>> re.escape('www.stackoverflow.com')
'www\\.stackoverflow\\.com'
>>> print(re.escape('www...
What is the difference between an annotated and unannotated tag?
If I want to tag the current commit. I know both of the following command lines work:
3 Answers
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Oracle PL/SQL - How to create a simple array variable?
I'd like to create an in-memory array variable that can be used in my PL/SQL code. I can't find any collections in Oracle PL/SQL that uses pure memory, they all seem to be associated with tables. I'm looking to do something like this in my PL/SQL (C# syntax):
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Daylight saving time and time zone best practices [closed]
...lding) the JODA jar file as per this article (joda.org/joda-time/tz_update.html) in order to keep up to date with the latest timezone information. Is there any standard way of downloading the latest timezone data from IANA website (iana.org/time-zones) and rebuilding the joda library? In other words...
Specify custom Date format for colClasses argument in read.table/read.csv
Is there a way to specify the Date format when using the colClasses argument in read.table/read.csv?
4 Answers
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Can I simultaneously declare and assign a variable in VBA?
I'm new to VBA and want to know if I can convert the following declaration and assignment into one line:
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Table with fixed header and fixed column on pure css
I need to create a html table (or something similar looking) with a fixed header and a fixed first column.
20 Answers
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Is git not case sensitive?
In the first commitment of my partial called _Electronics it was written beginning with a capital letters, then I changed it to _electronics .
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